Maybe Wingardium Leviosa!, at first, anyway.
It was the first charm I ever got down really pat. I really really like it. I didn't know how to stop it though ... these things the teachers don't tell you! So until someone came along and did the finite charm, there were some things, and cats and pizzas and a cup of coffee floating around ....
I learned another piece of magic well since then, but it's one that a lot of folks have. The Expecto Patronum! one.
Siggy and Avatar made by RADM Amy"You have the inborn natural right to remain silent. Don't think about it, don't talk about it, shuush ....... STILL." ~ Xaris